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<BODY><H2><a href="../contents.htm">Tcl8.6.11/Tk8.6.11 Documentation</a> <small>&gt;</small> <a href="contents.htm">Tk C API</a> <small>&gt;</small> HandleEvent</H2>
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<H3><A NAME="M2">NAME</A></H3>
Tk_HandleEvent &mdash; invoke event handlers for window system events
<H3><A NAME="M3">SYNOPSIS</A></H3>
<B>#include &lt;tk.h&gt;</B><BR>
<B>Tk_HandleEvent</B>(<I>eventPtr</I>)<BR>
<H3><A NAME="M4">ARGUMENTS</A></H3>
<DL class="arguments">
<DT>XEvent <B>*eventPtr</B> (in)<DD>
Pointer to X event to dispatch to relevant handler(s). It is important
that all unused fields of the structure be set to zero.
<P></DL>
<H3><A NAME="M5">DESCRIPTION</A></H3>
<B>Tk_HandleEvent</B> is a lower-level procedure that deals with window
events.  It is called by <B><A HREF="../TclLib/Notifier.htm">Tcl_ServiceEvent</A></B> (and indirectly by
<B><A HREF="../TclLib/DoOneEvent.htm">Tcl_DoOneEvent</A></B>), and in a few other cases within Tk.
It makes callbacks to any window event
handlers (created by calls to <B><A HREF="../TkLib/EventHndlr.htm">Tk_CreateEventHandler</A></B>)
that match <I>eventPtr</I> and then returns.  In some cases
it may be useful for an application to bypass the Tk event
queue and call <B>Tk_HandleEvent</B> directly instead of
calling <B><A HREF="../TclLib/Notifier.htm">Tcl_QueueEvent</A></B> followed by
<B><A HREF="../TclLib/Notifier.htm">Tcl_ServiceEvent</A></B>.
<P>
This procedure may be invoked recursively.  For example,
it is possible to invoke <B>Tk_HandleEvent</B> recursively
from a handler called by <B>Tk_HandleEvent</B>.  This sort
of operation is useful in some modal situations, such
as when a
notifier has been popped up and an application wishes to
wait for the user to click a button in the notifier before
doing anything else.
<H3><A NAME="M6">KEYWORDS</A></H3>
<A href="../Keywords/C.htm#callback">callback</A>, <A href="../Keywords/E.htm#event">event</A>, <A href="../Keywords/H.htm#handler">handler</A>, <A href="../Keywords/W.htm#window">window</A>
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